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Mostrando ítems 21-30 de 157
Ultraestructura del bambú Guadua angustifolia var. bicolor (Poaceae: Bambusoideae), presente en Costa Rica
(2006-08-20)
Sections of leaf lamina, leaf sheath and branches of adult Guadua paniculata collected in Costa Rica,
were studied ultrastructurally. Diagnostic ultrastructural characteristics include the cellular pattern of the adaxial ...
Lepanthes gerardensis (Orchidaceae), una nueva especie de Costa Rica
(Universidad de Costa Rica, 2003)
Lepanthes gerardensis from north-central Costa Rica is described and illustrated. It is most similar to the Mexican L. ancylopetala Dressler, from which it differs in shorter habit, petiolate leaves with broadly elliptic ...
Humedales del Parque Nacional Chirripó, Costa Rica: características, relaciones geomorfológicas y escenarios de cambio climático
Wetlands of the Chirripó National Park, Costa Rica: characteristics, geomorphological relationships and climate change scenarios.
(2018-12)
The geomorphological, climatological and hydrological characteristics of the high Andean wetlands of the Chirripó National Park (PNCh) are analyzed. The PNCh is located in south-central Costa Rica, Central America. This ...
Ammonium and phosphate removal using batch laboratory cultures by microalgae and cyanobacteria isolated from Costa Rica water bodies
Remoción de amonio y fosfato en cultivos de laboratorio con microalgas y cianobacterias aisladas de cuerpos de agua de Costa Rica
(2018)
This research analyzed three green microalgae (Scenedesmus sp., Chlamydomonas sp., and Chlorella
sp.) and two cyanobacteria (Synechocystis sp. as unicellular strain and Nostoc sp. as filamentous strain) native
from Costa ...
A reliable bioassay procedure to evaluate per os toxicity of Bacillus thuringiensis strains against the rice delphacid, Tagosodes orizicolus (Homoptera: Delphacidae)
(Universidad de Costa Rica, 2007)
A reliable bioassay procedure was developed to test ingested Bacillus thuringiensis (Bt) toxins on the rice delphacid Tagosodes orizicolus. Initially, several colonies were established under greenhouse conditions, using ...
New record of the starfish Ophidiaster ludwigi (Echinodermata: Asteroidea) from the Pacific of Mexico and Costa Rica
(2017)
Ophidiaster ludwigi had been reported only from Panama and Peru. Here we add record of the genus and species for Mexico and Costa Rica; and, first time its bathymetric distribution (0-156 m)
Desarrollo costero y ambientes marino-costeros en Bahía Culebra, Guanacaste, Costa Rica
Coastal development and marine ecosystems in Culebra Bay, Guanacaste, Costa Rica
(2018-04-01)
Bahía Culebra ha experimentado un proceso acelerado de desarrollo costero desde la implementación del proyecto Polo Turístico Golfo de Papagayo. Este trabajo analiza el cambio temporal en el estado de salud sus ecosistemas ...
Equinodermos del Museo de Zoología de la Universidad de Costa Rica
Echinoderms from the Museum of Zoology from the Universidad de Costa Rica
(2017)
El Museo de Zoología de la Universidad de Costa Rica (MZUCR) se funda en 1966 y alberga la colección de organismos vertebrados e invertebrados más completa de Costa Rica. El MZUCR cuenta actualmente con 24 ...
A two-patch epidemic model with nonlinear reinfection
Un modelo epidémico de dos poblaciones con reinfección no lineal
(2020)
The propagation of infectious diseases and its impact on individuals play a major role in disease dynamics, and it is important to incorporate population heterogeneity into efforts to study diseases. As a simplistic but ...
Introducción a los grupos de macroinvertebrados acuáticos
(2010)
Cada ambiente requiere adaptaciones particulares y por lo tanto alberga distintos grupos de organismos. El agua dulce es un medio distinto del agua salada y de la tierra firme. Muy pocas especies son capaces de vivir en ...